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Abstract

This work demonstrates photo alignment and electrical tuning effects in photonic liquid crystal fiber (PLCF). Applying voltages of 0~130V and 250~400V shifts the short and long wavelength edges of the transmission bands by about 45nm and 74nm toward longer wavelengths, respectively. An electro-tunble notch filter is formed in the PLCF without the use of gratings. The range of tunability of the notch filter is around 180nm with an applied voltage of 140~240V. This photo-induced alignment yields a permanently tilted LC structure in PCF, which reduces the threshold voltage, and can be further modulated by electric fields. The polarization dependent loss and fast response time of photo-aligned PLCF is also demonstrated. The finite-difference frequency-domain method is adopted to analyze the shift of the transmission bandgap, and the simulation results are found to correlate well with experimental data.